Multi-Tool Cap Screw Counterbores
  aptusa

For Forward & Backward Application – Patented

Designed to counterbore holes for standard cap screws. Using the same
Piloted holder, you can forward counterbore, back counterbore, and spotface.
Uses the same simple design of the multi-tool system. Just choose the
appropriate blade for your application.

 

Compatible Blades
Piloted Holders